You haven't really given us enough info to go on here. Assuming you utilize Zerotier as VPN remote access to your network, you could utilize a dual NIC setup but it may not be necessary. That really depends on your network design which you haven't shared with us.
The right camera for you is very subjective based on your use case, location, lighting available etc. . Start reading here and you'll find lots of good info to help you decide:
https://ipcamtalk.com/wiki/ip-cam-talk-cliff-notes/
Maybe you could do something remote via something like zoom or Google meet? In a pinch I think you could register a domain for about $10 even if it’s just temporary.
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I would find another DDNS service to use. Sounds like this one isn't coming back anytime soon if at all. Here is a hint look here:
https://ipcamtalk.com/tools/ddns/
They aren't just down, they are gone. Can't even find them in DNS:
*** dns.google can't find ghiddns.com: Non-existent domain
Server: dns.google
Address: 8.8.8.8
Does your switch in the shed support VLANs? I have a very similar situation and run 3 cams and an AP. The cams are on a completely different VLAN with no Internet access and anyone who uses the AP does have Internet access through it.
Facebook posted that it was a router config change which broke BGP which tells other networks how to route to it. Other ISP outages were merely a bad coincidence.
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I have exactly what you have drawn, with multiple switches daisy chained with various cameras on each switch. Agree with @sebastiantombs on the Gig uplinks.
You can also check the log which would show what clients you have synching their time with your NTP server. Click settings and toward the bottom of the screen, select the view button next to logging level. You should see entries that look like this:
9/20/2021 4:01:48 PM Sent NTP Response to...
Welcome to the forum. Make sure to checkout the information in the wiki section of this forum. There is plenty of compiled info there that will help you on the journey to camera nirvana.
You should stop port forwarding and look at setting up your own vpn. Regardless of what port you change it to, they will find the new one. Plenty of info here on setting up something like OpenVPN to solve this issue.
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You are correct. In the thermostat scenario, it builds a tunnel to the manufacturer's "cloud". Your phone is not talking to the thermostat when you access it via the app, it's talking to the manufacturer's cloud which is already maintaining connectivity to your thermostat via that "secure"...
I do something very similar to what @TonyR does - but yes all the cams are statically configured. Not too too bad unless you are running a ton of them in which case it does make for a bit of work if you need to make a change. If you absolutely wanted to go down the DHCP route, you could put a...
You'll need to open the UI3 ports on your router for that to work off of wi-fi. Alternatively, setup a VPN and configure the app on your phone to use the local IP for both the local and WAN IP settings.
Is there some setting in the NVR that allows routing to the camera network? It sounds like that's the function of the NVR when clicking the "E" as mentioned above. I'm not an NVR user but I do know, that without some device acting as a router between the 192.X.X.X and the 10.x.x.x networks...
You check the windows firewall settings to verify the other browsers have rules configured to allow them network access? Or, you could try disabling the windows firewall altogether.
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I do what @wittaj mentioned above. You can also manually control it through the use of profiles and associated schedules. I have profiles setup that stop alerts for given amounts of time. It's useful when I'm out working in the yard and it keeps my phone from blowing up with alerts.